Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
93.7
96
93
93
97
94
February
93.2
90
90
91
94
91
March
90.9
81
88
89
94
94
April
95.4
96
95
99
97
94
May
96.1
94
93
94
99
June
98.4
95
97
99
100
July
98.4
98
100
97
98
August
98.2
97
99
99
100
September
92.6
69
97
99
98
October
92.0
94
90
100
93
November
93.6
94
91
97
96
December
92.7
91
100
90
99
Average
94.5
90.5
91.5
94.6
96.1
96.5
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
8.0
7
8
9
7
8
February
9.8
11
9
8
9
10
March
13.2
12
11
13
12
14
April
18.3
19
18
20
18
19
May
22.6
22
25
21
25
June
28.0
26
28
27
29
July
28.9
32
29
27
29
August
27.6
29
26
27
31
September
25.6
26
27
27
25
October
18.2
20
16
18
21
November
13.3
13
11
14
15
December
9.4
8
9
12
9
Average
17.8
11.8
18.4
18.7
18.3
19.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-6.4
-6
-5
-7
-6
-5
February
-5.7
-2
-5
-7
-5
-5
March
-2.6
0
-2
-3
-2
0
April
1.8
3
2
3
0
1
May
6.6
7
9
7
8
June
11.3
10
13
12
12
July
13.6
15
15
14
13
August
12.8
14
13
13
13
September
9.5
11
10
11
7
October
3.4
4
4
9
3
November
-2.8
-1
-3
-1
-1
December
-5.7
-3
-4
-1
-6
Average
2.9
-2.5
3.7
3.8
3.9
3.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.5
6
5
3
5
4
February
5.4
5
13
8
1
7
March
8.0
18
12
9
5
3
April
2.8
0
5
0
2
3
May
2.6
6
1
3
0
June
2.2
2
1
5
2
July
2.0
2
3
1
3
August
2.1
3
2
3
1
September
2.4
2
1
3
1
October
7.3
1
18
3
6
November
3.1
6
4
1
0
December
3.0
9
0
0
1
Average
4.0
7.4
5.3
4.2
2.6
2.5
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
10.8
11
13
9
10
11
February
13.1
13
14
11
12
12
March
13.6
14
15
13
14
14
April
13.7
12
15
17
13
13
May
12.4
11
15
12
12
June
11.0
12
12
9
12
July
8.1
10
8
8
8
August
7.9
9
7
8
8
September
9.3
10
9
9
8
October
10.6
8
9
14
11
November
10.4
9
11
9
12
December
11.0
10
13
15
10
Average
11.2
12.5
11.2
11.0
10.8
10.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
230°
240°
203°
207°
228°
February
242°
239°
198°
219°
204°
March
236°
228°
234°
218°
228°
April
223°
239°
233°
211°
222°
May
201°
224°
189°
220°
June
225°
199°
184°
212°
July
184°
192°
164°
207°
August
179°
153°
180°
213°
September
215°
198°
189°
087°
October
199°
219°
234°
204°
November
214°
201°
164°
217°
December
267°
228°
237°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.